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<a href="#define-members">Macros</a>  </div>
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<div class="title">Internal memory pools<div class="ingroups"><a class="el" href="group__lwip.html">lwIP</a> &raquo; <a class="el" href="group__lwip__opts.html">Options (lwipopts.h)</a> &raquo; <a class="el" href="group__lwip__opts__infrastructure.html">Infrastructure</a></div></div>  </div>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="define-members"></a>
Macros</h2></td></tr>
<tr class="memitem:ga92b30aed958ec59334d936d4ca725418"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__lwip__opts__memp.html#ga92b30aed958ec59334d936d4ca725418">MEMP_NUM_PBUF</a>&#160;&#160;&#160;16</td></tr>
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</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<h2 class="groupheader">Macro Definition Documentation</h2>
<a id="ga87a05debb46ff82093d0e6dc1aad8804"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga87a05debb46ff82093d0e6dc1aad8804">&#9670;&nbsp;</a></span>LWIP_NUM_SYS_TIMEOUT_INTERNAL</h2>

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          <td class="memname">#define LWIP_NUM_SYS_TIMEOUT_INTERNAL&#160;&#160;&#160;(<a class="el" href="group__lwip__opts__tcp.html#gaa4ed98deb97b77c633cb8870f34c71e9">LWIP_TCP</a> + <a class="el" href="group__lwip__opts__ipv4.html#ga1a31ab0e0f37b17d40fa7c35bc2c4f69">IP_REASSEMBLY</a> + <a class="el" href="group__lwip__opts__arp.html#ga9609a014bba4638cc191d6a8f9556c87">LWIP_ARP</a> + (2*<a class="el" href="group__lwip__opts__dhcp.html#ga8a6ec62dc121064ac591b1fd8567bee9">LWIP_DHCP</a>) + <a class="el" href="group__lwip__opts__autoip.html#gaaf1b3a089827223589baf1b7f4f57069">LWIP_AUTOIP</a> + <a class="el" href="group__lwip__opts__igmp.html#gadaf25915ae1fd69c0943ef68cbb38923">LWIP_IGMP</a> + <a class="el" href="group__lwip__opts__dns.html#ga98710dd81446b7cb2daac736bae6f646">LWIP_DNS</a> + PPP_NUM_TIMEOUTS + (<a class="el" href="group__lwip__opts__ipv6.html#ga872e3bb3fe2212156d66b18fccc9643f">LWIP_IPV6</a> * (1 + <a class="el" href="group__lwip__opts__ipv6.html#gad0ef160d72e63b02c5e875b06ec53864">LWIP_IPV6_REASS</a> + <a class="el" href="group__lwip__opts__mld6.html#ga44d8f24eaebbc50221ac1336212a3528">LWIP_IPV6_MLD</a>)))</td>
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<p>The number of sys timeouts used by the core stack (not apps) The default number of timeouts is calculated here for all enabled modules. </p>

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<a id="ga24f6737ee990990b81b0d16ef6e0dffd"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga24f6737ee990990b81b0d16ef6e0dffd">&#9670;&nbsp;</a></span>MEMP_NUM_ALTCP_PCB</h2>

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          <td class="memname">#define MEMP_NUM_ALTCP_PCB&#160;&#160;&#160;<a class="el" href="group__lwip__opts__memp.html#ga73beecc19cfbc3114768f9b32b2cd70e">MEMP_NUM_TCP_PCB</a></td>
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<p>MEMP_NUM_ALTCP_PCB: the number of simultaneously active altcp layer pcbs. (requires the LWIP_ALTCP option) Connections with multiple layers require more than one altcp_pcb (e.g. TLS over TCP requires 2 altcp_pcbs, one for TLS and one for TCP). </p>

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<a id="ga5a95abf3610c56e7c23cb035eb9c3444"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga5a95abf3610c56e7c23cb035eb9c3444">&#9670;&nbsp;</a></span>MEMP_NUM_API_MSG</h2>

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          <td class="memname">#define MEMP_NUM_API_MSG&#160;&#160;&#160;<a class="el" href="group__lwip__opts__memp.html#gafbbfd6ce8536038cd00fa85bebae987c">MEMP_NUM_TCPIP_MSG_API</a></td>
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<p>MEMP_NUM_API_MSG: the number of concurrently active calls to various socket, netconn, and tcpip functions </p>

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<a id="ga087b00ea20a7edebcad33a1a1353a5d7"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga087b00ea20a7edebcad33a1a1353a5d7">&#9670;&nbsp;</a></span>MEMP_NUM_ARP_QUEUE</h2>

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<p>MEMP_NUM_ARP_QUEUE: the number of simultaneously queued outgoing packets (pbufs) that are waiting for an ARP request (to resolve their destination address) to finish. (requires the ARP_QUEUEING option) </p>

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<h2 class="memtitle"><span class="permalink"><a href="#ga3b1f228c598529c62895ad04ff294980">&#9670;&nbsp;</a></span>MEMP_NUM_DNS_API_MSG</h2>

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          <td class="memname">#define MEMP_NUM_DNS_API_MSG&#160;&#160;&#160;<a class="el" href="group__lwip__opts__memp.html#gafbbfd6ce8536038cd00fa85bebae987c">MEMP_NUM_TCPIP_MSG_API</a></td>
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<p>MEMP_NUM_DNS_API_MSG: the number of concurrently active calls to netconn_gethostbyname </p>

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<h2 class="memtitle"><span class="permalink"><a href="#ga1f66051a654dcd7a4e19bc6aff240630">&#9670;&nbsp;</a></span>MEMP_NUM_FRAG_PBUF</h2>

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<p>MEMP_NUM_FRAG_PBUF: the number of IP fragments simultaneously sent (fragments, not whole packets!). This is only used with LWIP_NETIF_TX_SINGLE_PBUF==0 and only has to be &gt; 1 with DMA-enabled MACs where the packet is not yet sent when netif-&gt;output returns. </p>

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<h2 class="memtitle"><span class="permalink"><a href="#gab648ff95d8ffa4216b95f82a568a5d9a">&#9670;&nbsp;</a></span>MEMP_NUM_IGMP_GROUP</h2>

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<p>MEMP_NUM_IGMP_GROUP: The number of multicast groups whose network interfaces can be members at the same time (one per netif - allsystems group -, plus one per netif membership). (requires the LWIP_IGMP option) </p>

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<h2 class="memtitle"><span class="permalink"><a href="#gaa9b0f949da12cbe8fe5f7aefc30290e0">&#9670;&nbsp;</a></span>MEMP_NUM_LOCALHOSTLIST</h2>

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          <td class="memname">#define MEMP_NUM_LOCALHOSTLIST&#160;&#160;&#160;1</td>
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<p>MEMP_NUM_LOCALHOSTLIST: the number of host entries in the local host list if DNS_LOCAL_HOSTLIST_IS_DYNAMIC==1. </p>

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<h2 class="memtitle"><span class="permalink"><a href="#ga5d99df65869ac101ed6a611fc85016be">&#9670;&nbsp;</a></span>MEMP_NUM_NETBUF</h2>

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<p>MEMP_NUM_NETBUF: the number of struct netbufs. (only needed if you use the sequential API, like <a class="el" href="api__lib_8c.html">api_lib.c</a>) </p>

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<h2 class="memtitle"><span class="permalink"><a href="#gacb40bd726b7e15593b20a628d298f456">&#9670;&nbsp;</a></span>MEMP_NUM_NETCONN</h2>

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<p>MEMP_NUM_NETCONN: the number of struct netconns. (only needed if you use the sequential API, like <a class="el" href="api__lib_8c.html">api_lib.c</a>) </p>

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<h2 class="memtitle"><span class="permalink"><a href="#ga293bc22b60bf3f8e2520f60a88370e7a">&#9670;&nbsp;</a></span>MEMP_NUM_NETDB</h2>

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          <td class="memname">#define MEMP_NUM_NETDB&#160;&#160;&#160;1</td>
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<p>MEMP_NUM_NETDB: the number of concurrently running lwip_addrinfo() calls (before freeing the corresponding memory using <a class="el" href="netdb_8c.html#a7f65ff5982a0743849a644ef2cd15ef5">lwip_freeaddrinfo()</a>). </p>

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<h2 class="memtitle"><span class="permalink"><a href="#gadd5a973b98068ce9318ea2f96b5fa14c">&#9670;&nbsp;</a></span>MEMP_NUM_NETIFAPI_MSG</h2>

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          <td class="memname">#define MEMP_NUM_NETIFAPI_MSG&#160;&#160;&#160;<a class="el" href="group__lwip__opts__memp.html#gafbbfd6ce8536038cd00fa85bebae987c">MEMP_NUM_TCPIP_MSG_API</a></td>
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<p>MEMP_NUM_NETIFAPI_MSG: the number of concurrently active calls to the netifapi functions </p>

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<h2 class="memtitle"><span class="permalink"><a href="#ga92b30aed958ec59334d936d4ca725418">&#9670;&nbsp;</a></span>MEMP_NUM_PBUF</h2>

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          <td class="memname">#define MEMP_NUM_PBUF&#160;&#160;&#160;16</td>
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<p>MEMP_NUM_PBUF: the number of memp struct pbufs (used for PBUF_ROM and PBUF_REF). If the application sends a lot of data out of ROM (or other static memory), this should be set high. </p>

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<h2 class="memtitle"><span class="permalink"><a href="#ga379bf92ed322cda54cb701337421e0d3">&#9670;&nbsp;</a></span>MEMP_NUM_RAW_PCB</h2>

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          <td class="memname">#define MEMP_NUM_RAW_PCB&#160;&#160;&#160;4</td>
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<p>MEMP_NUM_RAW_PCB: Number of raw connection PCBs (requires the LWIP_RAW option) </p>

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<h2 class="memtitle"><span class="permalink"><a href="#ga169436c5860253b90e25bdba9fdcac86">&#9670;&nbsp;</a></span>MEMP_NUM_REASSDATA</h2>

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          <td class="memname">#define MEMP_NUM_REASSDATA&#160;&#160;&#160;5</td>
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<p>MEMP_NUM_REASSDATA: the number of IP packets simultaneously queued for reassembly (whole packets, not fragments!) </p>

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<h2 class="memtitle"><span class="permalink"><a href="#ga8e136f5811e6652c6c5d2fcf596f0893">&#9670;&nbsp;</a></span>MEMP_NUM_SELECT_CB</h2>

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          <td class="memname">#define MEMP_NUM_SELECT_CB&#160;&#160;&#160;4</td>
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<p>MEMP_NUM_SELECT_CB: the number of struct <a class="el" href="structlwip__select__cb.html">lwip_select_cb</a>. (Only needed if you have LWIP_MPU_COMPATIBLE==1 and use the socket API. In that case, you need one per thread calling lwip_select.) </p>

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<h2 class="memtitle"><span class="permalink"><a href="#gacf9782dd26bf8a655044dc041a9de948">&#9670;&nbsp;</a></span>MEMP_NUM_SOCKET_SETGETSOCKOPT_DATA</h2>

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          <td class="memname">#define MEMP_NUM_SOCKET_SETGETSOCKOPT_DATA&#160;&#160;&#160;<a class="el" href="group__lwip__opts__memp.html#gafbbfd6ce8536038cd00fa85bebae987c">MEMP_NUM_TCPIP_MSG_API</a></td>
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<p>MEMP_NUM_SOCKET_SETGETSOCKOPT_DATA: the number of concurrently active calls to getsockopt/setsockopt </p>

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<h2 class="memtitle"><span class="permalink"><a href="#ga4afbdca581a58d57bc7a81118a95327e">&#9670;&nbsp;</a></span>MEMP_NUM_SYS_TIMEOUT</h2>

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          <td class="memname">#define MEMP_NUM_SYS_TIMEOUT&#160;&#160;&#160;<a class="el" href="group__lwip__opts__memp.html#ga87a05debb46ff82093d0e6dc1aad8804">LWIP_NUM_SYS_TIMEOUT_INTERNAL</a></td>
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<p>MEMP_NUM_SYS_TIMEOUT: the number of simultaneously active timeouts. The default number of timeouts is calculated here for all enabled modules. The formula expects settings to be either '0' or '1'. </p>

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<h2 class="memtitle"><span class="permalink"><a href="#ga73beecc19cfbc3114768f9b32b2cd70e">&#9670;&nbsp;</a></span>MEMP_NUM_TCP_PCB</h2>

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<p>MEMP_NUM_TCP_PCB: the number of simultaneously active TCP connections. (requires the LWIP_TCP option) </p>

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<h2 class="memtitle"><span class="permalink"><a href="#ga04fba6a249123513271dccb4ec26aa5a">&#9670;&nbsp;</a></span>MEMP_NUM_TCP_PCB_LISTEN</h2>

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          <td class="memname">#define MEMP_NUM_TCP_PCB_LISTEN&#160;&#160;&#160;8</td>
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<p>MEMP_NUM_TCP_PCB_LISTEN: the number of listening TCP connections. (requires the LWIP_TCP option) </p>

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<h2 class="memtitle"><span class="permalink"><a href="#gaa35fb3a1a76661e3ffb9722a57092de3">&#9670;&nbsp;</a></span>MEMP_NUM_TCP_SEG</h2>

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          <td class="memname">#define MEMP_NUM_TCP_SEG&#160;&#160;&#160;16</td>
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<p>MEMP_NUM_TCP_SEG: the number of simultaneously queued TCP segments. (requires the LWIP_TCP option) </p>

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<a id="gafbbfd6ce8536038cd00fa85bebae987c"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gafbbfd6ce8536038cd00fa85bebae987c">&#9670;&nbsp;</a></span>MEMP_NUM_TCPIP_MSG_API</h2>

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<p>MEMP_NUM_TCPIP_MSG_API: the number of struct tcpip_msg, which are used for callback/timeout API communication. (only needed if you use <a class="el" href="tcpip_8c.html">tcpip.c</a>) </p>

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<h2 class="memtitle"><span class="permalink"><a href="#gab089a7088439e726c3801ba9e249d831">&#9670;&nbsp;</a></span>MEMP_NUM_TCPIP_MSG_INPKT</h2>

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<p>MEMP_NUM_TCPIP_MSG_INPKT: the number of struct tcpip_msg, which are used for incoming packets. (only needed if you use <a class="el" href="tcpip_8c.html">tcpip.c</a>) </p>

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<a id="ga2c416da481ab09bd1ba257b75a0707eb"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga2c416da481ab09bd1ba257b75a0707eb">&#9670;&nbsp;</a></span>MEMP_NUM_UDP_PCB</h2>

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<p>MEMP_NUM_UDP_PCB: the number of UDP protocol control blocks. One per active UDP "connection". (requires the LWIP_UDP option) </p>

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<h2 class="memtitle"><span class="permalink"><a href="#ga50eaadc4cad0716410332691e382c38a">&#9670;&nbsp;</a></span>PBUF_POOL_SIZE</h2>

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          <td class="memname">#define PBUF_POOL_SIZE&#160;&#160;&#160;16</td>
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<p>PBUF_POOL_SIZE: the number of buffers in the pbuf pool. </p>

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